Accession Number : AD0284897

Title :   KINETICS OF THE BAINITE REACTION IN ALLOY STEELS

Corporate Author : METAL HYDRIDES INC BEVERLY MASS

Personal Author(s) : GOODENOW,R.H. ; HEHEMANN,R.F.

Report Date : JUL 1962

Pagination or Media Count : 1

Abstract : A study was made of the structure, reaction kinetics and mechanism of the bainite reaction in alloy steels. The kinetics of the over-all reaction are influenced significantly by prior thermal history. Transformation is retarded by prior transformation at a higher temperature in this range and stabilization of the bainite reaction, analogous to the stabilization of the martensite reaction, accompanies this treatment. Prior treatment at a lower temperature acceler-ATES THE BAINITE REACTION AND THIS ACCELERATION CAN BE REMOVED BY INSERTING AN ANNEALING TREATMENT IN THE BAY BETWEEN THE PRIOR AND THE FINAL ISOTHERMAL TRANSFORMATIONS. This suggests that the acceleration effect results primarily from the ability of transformation strain to catalyse nucleation of the bainite reaction. A study of carbon enrichment of austenite and the carbide phase in bainite indicates that there is a fundamental difference between upper and lower bainite. It is suggested that variations in interface mobility are associated with the structural difference between upper and lower bainite. (Author)

Descriptors :   *BAINITE, *STEEL, CHEMICAL REACTIONS, TEMPERATURE, TRANSFORMATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE